--- a/openbsd-compat/regress/Makefile.in	2020-02-15 10:59:01.210601434 -0700
+++ b/openbsd-compat/regress/Makefile.in	2020-02-15 10:59:18.753485852 -0700
@@ -7,7 +7,7 @@
 CC=@CC@
 LD=@LD@
 CFLAGS=@CFLAGS@
-CPPFLAGS=-I. -I.. -I$(srcdir) -I$(srcdir)/.. @CPPFLAGS@ @DEFS@
+CPPFLAGS=-I. -I.. -I../.. -I$(srcdir) -I$(srcdir)/.. @CPPFLAGS@ @DEFS@
 EXEEXT=@EXEEXT@
 LIBCOMPAT=../libopenbsd-compat.a
 LIBS=@LIBS@